CN202676278U - A sound pressure signal monitoring device of ocean background noise - Google Patents
A sound pressure signal monitoring device of ocean background noise Download PDFInfo
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- CN202676278U CN202676278U CN 201220225285 CN201220225285U CN202676278U CN 202676278 U CN202676278 U CN 202676278U CN 201220225285 CN201220225285 CN 201220225285 CN 201220225285 U CN201220225285 U CN 201220225285U CN 202676278 U CN202676278 U CN 202676278U
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Abstract
The utility model discloses a sound pressure signal monitoring device of ocean background noise. The sound pressure signal monitoring device comprises a housing body, and a light path system, a control system, and a power supply system which are disposed in the housing body. An opening is arranged on the left or right side of the housing body. A vibrating reed equipped with a reflecting plane is mounted at the opening. An enclosed cavity is formed by the vibrating reed and the housing body and the reflecting plane of the vibrating reed faces interior of the cavity. A separating plate equipped with a window is disposed inside the cavity so as to divide the cavity into a left part and a right part. The part where the vibrating reed is arranged is an air cavity which communicates with an air bag outside the housing body through a pipeline, while the other part is a device cavity where the control system, the power supply system, and a laser, a half-transmitting and half-reflecting spectroscope, a planar mirror, and a photoelectric receiver in the light path system are arranged. Structure of the light path system is designed by using Michelson interference principle in order to achieve high precision and good linearity. And the sound pressure signal monitoring device has no signal attenuation in low-frequency band and has good frequency response characteristic.
Description
Technical Field
The utility model belongs to the technical field of monitoring devices under water, specifically speaking relates to an equipment that is used for carrying out acoustic pressure signal monitoring to the background noise at ocean.
Background
The characteristics and the model of the ocean background noise field are researched, the motion process of the ocean can be inverted, the behavior of the marine animals can be known, and the underwater target identification, sonar performance evaluation and underwater acoustic countermeasure research can be further facilitated. With the development of modern industrial production, marine shipping and fishery, the characteristics of marine background noise become more complex, which also puts higher demands on the monitoring of marine noise.
The traditional sound pressure monitoring device for detecting underwater noise mainly adopts piezoelectric, capacitive and magnetoelectric measurement principles, and has the defects of nonlinearity, narrow bandwidth, rapid reduction of signal sensitivity in a low-frequency band and the like. The low frequency band is a main frequency band in the field of modern ocean background noise and target recognition research, so that the requirement for accurately monitoring the sound pressure intensity of the ocean background noise cannot be well met by adopting the conventional sound pressure monitoring device.
Disclosure of Invention
The utility model discloses based on laser interference principle, provided a ocean background noise acoustic pressure signal monitoring facilities to improve the detection precision to ocean background noise acoustic pressure signal.
In order to solve the technical problem, the utility model discloses a following technical scheme realizes:
a marine background noise sound pressure signal monitoring device comprises a shell, and an optical path system, a control system and a power supply system which are arranged in the shell; the left side or the right side of the shell is provided with an opening, a vibrating piece with a reflecting surface is arranged at the opening, a closed cavity is formed by the vibrating piece and the shell, and the reflecting surface of the vibrating piece faces the cavity; a partition plate with a perspective window is arranged in the cavity to divide the cavity into a left part and a right part, wherein the cavity in which the vibrating reed is arranged is an air chamber and is communicated with an air bag positioned outside the shell through a pipeline, and the other cavity is a device chamber and is provided with the control system, the power supply system, a laser in the optical path system, the semi-transmission semi-reflection spectroscope, the plane reflector and the photoelectric receiver; the laser device emits laser to the spectroscope, one path of light beam is formed by reflection of the spectroscope and emitted to the plane reflector as a reference arm, and the other path of light beam is formed by transmission and emitted to a reflecting surface of the vibrating piece as a measuring arm which penetrates through the transparent window; two paths of light beams reflected by the plane reflecting mirror and the vibrating plate form interference through the spectroscope and then are emitted into the photoelectric receiver, and then a current output signal is generated by the photoelectric receiver and transmitted to a controller in a control system; the control system also comprises piezoelectric ceramics which are arranged on the plane reflector, receive voltage signals output by the controller and drive the plane reflector to move by utilizing self deformation.
Preferably, two piezoelectric ceramics are preferably mounted on the plane mirror, and one piezoelectric ceramic receives a modulation signal output by the controller and is used for judging the deformation direction of the vibrating reed; and the other receives the compensation voltage output by the controller to track the deformation quantity of the vibrating plate.
Furthermore, the two piezoelectric ceramics are butted and bonded together according to the same polarization direction and are arranged on the back surface of the plane mirror.
Preferably, the controller comprises an a/D converter, a D/a converter and a CPU, and a current output signal output by the photoelectric receiver is converted into a digital signal by the a/D converter and then transmitted to the CPU; the CPU outputs a voltage signal to the piezoelectric ceramic through a D/A converter.
Still further, an electromagnetic valve is installed in the pipeline, receives a switch control signal output by the controller, and after the equipment is drained, the electromagnetic valve is controlled to be opened through the controller, so that the pressure in the air chamber is kept consistent with the external water pressure.
Preferably, the transparent window is preferably made of flat glass and is mounted on the partition plate.
In order to reduce the volume of the whole monitoring equipment, the optical path system also comprises three reflecting mirrors which are obliquely arranged, a first reflecting mirror and the laser are arranged at the upper position in the device chamber, a second reflecting mirror and the spectroscope are arranged at the middle position, the second reflecting mirror and the vibrating piece are respectively arranged at the left side and the right side of the spectroscope, and a third reflecting mirror and the plane reflecting mirror are arranged at the lower position; the laser emits laser along the horizontal direction, the laser irradiates into a first reflecting mirror at an incidence angle of 45 degrees, light beams in the vertical direction formed by reflection enter into a second reflecting mirror at an incidence angle of 45 degrees, then the light beams in the horizontal direction formed by reflection through the second reflecting mirror irradiate into a spectroscope at an incidence angle of 45 degrees, a first section of reference arm light beams in the vertical direction formed by reflection through the spectroscope irradiates into a third reflecting mirror at an incidence angle of 45 degrees, and then a second section of reference arm light beams in the horizontal direction formed by reflection through the third reflecting mirror irradiates to a plane reflecting mirror which is vertically arranged; the photoelectric receiver is arranged above the spectroscope and receives two beams of light rays which vertically enter.
In order to facilitate the collection of the interference pattern, a beam expander is further arranged between the second reflecting mirror and the spectroscope, and the diameter of a laser beam emitted by the laser is expanded through the beam expander.
And a communication system is further arranged in the device chamber and is connected with the controller, and the detection result generated by the calculation of the controller is uploaded to an upper computer for display and storage.
Preferably, the communication system is connected with the upper computer for communication through a communication cable.
Compared with the prior art, the utility model discloses an advantage is with positive effect: the utility model discloses an ocean background noise acoustic pressure signal monitoring facilities utilizes the michelson to interfere the principle and carries out optical path system's structural design, vibration through trembler response ocean background noise, and then make the light beam length as the measuring arm change, from this change through the beam splitting mirror reflection with transmit the interference fringe that two bundles of light formed, alright from this with calculate ocean background noise's amplitude indirectly through the change that detects interference fringe, and can further compensate the amplitude that calculates through the distance of adjusting reference arm, in order to obtain more accurate acoustic pressure size. The monitoring equipment designed by the method has high precision and good linearity, no attenuation is caused in the range of 0-10KHz, especially in low-frequency band signals, the monitoring equipment has good frequency response characteristics, the performance of the monitoring equipment is stable, the measurement precision is less influenced by the sensitivity of devices in the equipment, and the manufacturing integration is easy to realize.
Other features and advantages of the present invention will become more apparent from the following detailed description of embodiments of the invention, which is to be read in connection with the accompanying drawings.
Drawings
Fig. 1 is a schematic diagram of the overall structure of the marine background noise sound pressure signal monitoring device of the present invention;
FIG. 2 is a schematic diagram of the design of the optical path system and control system of FIG. 1;
fig. 3 is a schematic diagram of a layout structure of an embodiment of an optical path system in a shell of the sound pressure monitoring device;
FIG. 4 is a schematic illustration of an interference pattern centered on a bright spot;
fig. 5 is a graph showing a resultant of a displacement waveform of an interference fringe and a current output signal when the vibrating piece is in an initial state;
FIG. 6 is a graph showing a combination of a displacement waveform of interference fringes and a current output signal when the vibrating plate is moved inward;
fig. 7 is a graph showing a combination of a displacement waveform of an interference fringe and a current output signal when the vibrating piece is moved outward.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
The utility model discloses a marine background noise acoustic pressure signal monitoring facilities is based on the design of michelson interference principle and forms, adopts the method of compensation to monitor marine background noise's acoustic pressure, is superior to the acoustic pressure monitoring facilities who adopts piezoelectric type, capacitanc, magnetoelectric measurement principle design at present in the aspect of sensitivity, stability, frequency response ability especially are the signal response ability of low-frequency range.
The specific construction structure and the operation principle of the marine background noise sound pressure signal monitoring device are explained in detail below by a specific embodiment.
In the first embodiment, referring to fig. 1, the marine background noise sound pressure signal monitoring device of the present embodiment mainly includes a housing 2, and an optical path system, a control system, a power supply system, a communication system, and the like, which are disposed in the housing 2. The power supply system is used for providing working voltage for the optical path system, the control system and the communication system; the communication system is connected with the control system, the sound pressure of the ocean background noise generated by the control system is uploaded to an upper computer on the shore, the monitoring data is displayed to the working personnel in real time through the upper computer, and long-term continuous storage of the monitoring data is completed, so that the research and analysis of the ocean environment can be conveniently carried out by the research personnel at any time. In this embodiment, the communication system and the upper computer are preferably connected and communicated through a communication cable in a wired signal transmission manner. The communication cable may be integrally designed with a rope for lowering the sound pressure monitoring device, and is lowered with the sound pressure monitoring device together with the rope. Of course, the sound pressure monitoring device may not be provided with a communication system, and a storage device, such as an SD card or a TF card, may be provided in the control system for storing the monitored marine sound pressure data. After the monitoring task is finished, the sound pressure monitoring equipment is lifted out of the water surface, the storage device is connected with the computer for communication, and the download and output of monitoring data are realized for a researcher to fetch and use.
For the optical path system and the control system, the design principle is shown in fig. 2.
The optical path system of the present embodiment mainly includes a laser 3, a spectroscope 5, a plane mirror 11, a vibrating piece 1, a photoelectric receiver 4, and the like. The spectroscope 5 may be a semi-transmissive and semi-reflective spectroscope lens, and is inclined at an acute angle of 45 ° to the horizontal plane. The laser 3 and the vibrating piece 1 are correspondingly arranged on the left side and the right side of the spectroscope 5. The vibrating reed 1 is vertically installed at an opening on one side of the case 2, the opening may be opened on the left side of the case 2 as shown in fig. 2, or may be opened on the right side of the case 2, and a closed chamber is formed by the vibrating reed 1 and the case 2. The control system, the communication system, the power supply system and other parts except the vibrating reed 1 in the optical path system are all arranged in the chamber, and the sound pressure change of the ocean noise is induced only by the fact that the vibrating reed 1 is contacted with the seawater. In this embodiment, the vibrating reed 1 is a vibrating reed with a reflective surface, and can be designed and implemented by forming a reflective film on the surface of a stainless steel plate by a sputtering process, and the reflective surface of the vibrating reed 1 faces the spectroscope 5 inside the chamber. The planar reflector 11 and the photoelectric receiver 4 are correspondingly arranged on the upper side and the lower side of the spectroscope 5, the piezoelectric ceramics 9 and 10 are arranged on the back surface of the planar reflector 11, and the planar reflector 11 is driven to move by controlling the deformation of the piezoelectric ceramics 9 and 10 so as to compensate the displacement change of the vibrating piece 1. As a preferable design of this embodiment, it is preferable that two piezoelectric ceramics 9 and 10 are mounted on the back surface of the plane mirror 11, the two piezoelectric ceramics 9 and 10 are bonded to each other in a butt joint manner in the same polarization direction, and then mounted on the plane mirror 11, and the displacement of the plane mirror 11 is controlled by the deformation of the two piezoelectric ceramics 9 and 10.
In addition to the two piezoelectric ceramics 9 and 10, a controller is provided in the control system. The controller is correspondingly connected with the photoelectric receiver 4 and the two piezoelectric ceramics 9 and 10 respectively, on one hand, receives a current signal output by the photoelectric receiver 4, and on the other hand, outputs a voltage signal to the two piezoelectric ceramics 9 and 10 to control the deformation quantity of the two piezoelectric ceramics 9 and 10.
As a preferred design of this embodiment, the controller is preferably implemented by a CPU chip, and an a/D converter and a D/a converter are combined, as shown in fig. 2.
The working principle of the marine background noise sound pressure signal monitoring device proposed in this embodiment is specifically explained below with reference to the optical path system and the control system shown in fig. 2.
The laser emitted by the laser 3 is used as a light source to emit to the spectroscope 5. In order to facilitate the sampling of the interference pattern, a beam expander 8 is preferably further installed between the laser 3 and the beam splitter 5, as shown in fig. 2. In this embodiment, the system design is preferably performed by using a beam expander 8 with a magnification of 10 times, and the diameter of the laser beam after beam expansion can reach 5.4 mm. After laser emitted by the laser 3 passes through the beam expander 8, the diameter of the light beam is enlarged, and the laser after beam expansion is divided into two paths at the spectroscope 5: one path is a light beam S0 formed by reflection of the beam splitter 5, which is defined as a reference arm and vertically emitted to the plane mirror 4; the other path is a light beam S1 formed by the transmission of the beam splitter 5, which is defined as a measuring arm and is vertically directed to the reflection surface of the vibrating reed 1. Then, the light beam S0 as the reference arm is reflected by the plane mirror 4, re-emitted to the beam splitter 5, transmitted by the beam splitter 5, and then vertically incident into the photoelectric receiver 4. The light beam S1 as the measuring arm is reflected by the reflection surface of the vibrating reed 1, then re-emitted to the beam splitter 5, reflected by the beam splitter 5, and then vertically incident into the photoelectric receiver 4. The two light beams entering the photo-receiver 4 are converged at the photo-receiver 4 to form an interference pattern, as shown in fig. 4, the photo-receiver 4 generates a current output signal corresponding to the received light intensity according to the received light intensity, and outputs the current output signal to the CPU chip after the conversion processing from an analog signal to a digital signal is performed by an a/D converter.
When the vibrating reed 1 is subjected to external pressure, deformation occurs, so that the length of the measuring arm is changed, and interference fringes are changed. In this embodiment, the deformation amount of the vibrating piece 1 is indirectly calculated based on such a change of the interference fringe, and the strength of the external pressure is converted.
Considering that when the sound pressure signal monitoring device is lowered into water, the water pressure applied to the device will be different according to the depth of the water in which the device is located, which will cause the vibration plate 1 to be deformed by the water pressure when no noise is applied to the vibration plate 1, so that the interference fringes will deviate from the initial state. In order to maintain the initial state of the interference fringes when no noise is applied to the vibrating reed 1, so as to facilitate the subsequent sound pressure calculation process, in the present embodiment, a sealed air chamber a is preferably partitioned in the sealed cavity formed by the case 2 and the vibrating reed 1, as shown in fig. 1 and 3. The air chamber a may be divided into a left part and a right part by disposing a partition 17 in a sealed chamber, wherein the chamber in which the vibrating reed 1 is disposed is the air chamber a, and the other chamber is the device chamber B. A see-through window 16 is provided in said partition 17 to avoid blocking the normal transmission of light. In this embodiment, the transparent window 16 is preferably made of plane glass, the measuring arm light beam S1 transmitted by the beam splitter 5 passes through the transparent window 16 to the reflection surface of the vibrating piece 1, and the light beam emitted by the reflection surface can also pass through the transparent window 16 to return to the beam splitter 5, so as to meet the normal transmission requirement of the light path. An air bag 13 is arranged outside the shell 2 and is communicated with the air chamber a through a pipeline 14, and an electromagnetic valve 15 is further arranged in the pipeline 14 and is electrically connected with the controller, specifically, is connected with the CPU chip through a D/a converter and receives a switch control signal output by the CPU to control the electromagnetic valve 15 to be switched on or off.
Before the sound pressure signal monitoring equipment is launched, the pressure of the inner side and the outer side of the vibrating reed 1 is atmospheric pressure P0, at the moment, the vibrating reed 1 is not deformed, the controller controls the electromagnetic valve 15 to be closed, and the interference pattern received by the photoelectric receiver 4 is just adjusted to a set initial state by pre-adjusting the optical path system. When the sound pressure signal monitoring equipment enters water, the vibrating plate 1 deforms along with the continuous change of the water depth. When the water entering the device reaches the designated water depth position, the external water pressure is P1, the pressure in the air chamber A is P0, and P1> P0, and the vibrating reed 1 deforms into the chamber. The electromagnetic valve 15 is opened by the controller to communicate the air chamber a with the air bag 13. Since the air bag 13 is also located at the same depth under water, the air bag 13 is also deformed and the pressure becomes P1. Since the air chamber a communicates with the airbag 13, the pressure in the air chamber a also becomes P1. At this time, the outer water pressure applied to the vibrating reed 1 is P1, the pressure in the air chamber a is also P1, and the vibrating reed 1 is restored to the initial state, i.e., no strain. Thus, the interference pattern can be restored to the original state again, and the vibration plate 1 is deformed again only when underwater noise acts on the vibration plate 1. At this time, the pressure calculated from the deformation amount of the vibrating piece 1 is the pressure of the ocean background noise.
The control system, the power supply system, the communication system and other devices in the optical path system except the vibrating reed 1 are arranged in the device chamber B as shown in fig. 1 and 3, so as to complete the overall design of the equipment.
In order to determine the vibration direction of the vibrating reed 1 and compensate the displacement of the vibrating reed 1, the present embodiment applies a voltage modulation signal with periodic sinusoidal variation to one piezoelectric ceramic 9 (which may be referred to as a first piezoelectric ceramic), and controls the first piezoelectric ceramic 9 to oscillate to form modulation of an optical signal, thereby achieving accurate determination of the vibration direction of the vibrating reed 1. Specifically, the voltage modulation signal may be generated and output by the CPU chip in cooperation with the D/a converter, and act on the first piezoelectric ceramic 9 to control the oscillation thereof. For another piezoelectric ceramic 10 (may be referred to as a second piezoelectric ceramic), an appropriate compensation voltage may be generated and output by the CPU chip in accordance with the deformation amount of the vibrating piece 1 in cooperation with the D/a converter, and applied to the second piezoelectric ceramic 10 to compensate for the change of the measuring arm. Then, the CPU chip can calculate the deformation amount of the second piezoelectric ceramic 10, that is, the deformation amount of the vibrating reed 1, based on the compensation voltage value outputted therefrom, and indirectly convert the sound pressure level of the detected marine background noise based on the deformation amount of the vibrating reed 1.
The following specifically explains the process of determining the deformation direction of the vibrating reed 1 and the step of measuring the sound pressure amplitude of the ocean background noise.
(1) Judgment of direction of vibration plate variation
First, the sound pressure monitoring device is initialized, and the optical path system is pre-adjusted, so that the photoreceiver 4 can just detect the central bright spot of the interference pattern, i.e. the interference fringe as shown in fig. 4.
Secondly, the sound pressure monitoring equipment is put under water, the sound pressure monitoring equipment is started to enter a normal working state, and the CPU is matched with the D/A converter to output a modulation signal to drive the first piezoelectric ceramic 9 to vibrate and modulate an optical signal. When the sound wave reaches the diaphragm 1, the diaphragm 1 vibrates, and the distance of the measuring arm S1 is changed, so that the interference fringes are changed accordingly.
Then, the CPU receives the photoelectric receiver 4 through the A/D converter to generateCurrent output signal iPDAnd combined with the modulated signal i output by the CPU0The vibration direction of the vibrating reed 1 is determined by the waveform of (a), as shown in fig. 5 to 7. FIGS. 5 to 7 are graphs showing the resultant of fringe displacement and current variation, where I represents light intensity, Δ x represents fringe displacement, and I representsPDRepresenting the current output signal i generated by the photoreceiver 40Representing a current modulation signal corresponding to the voltage modulation signal output by the CPU. The specific judgment process is as follows:
when the current value output by the photoelectric receiver 4 = the current value output by the photoelectric receiver 4 when the modulation signal is at the peak (that is, when the modulation signal output by the CPU is at the maximum value) = (that is, when the modulation signal output by the CPU is at the minimum value), that is, as shown in the waveform diagram shown in fig. 5, it indicates that the vibrating reed 1 is not deformed, and no noise acts on the vibrating reed 1. At this time, the CPU does not need to output the compensation voltage.
When the current value output from the photoelectric receiver 4 when the modulation signal is at the peak < the current value output from the photoelectric receiver 4 when the modulation signal is at the trough, that is, the waveform shown in fig. 6, it indicates that the vibrating reed 1 is deformed in the direction of narrowing the measuring arm S1. At this time, the CPU needs to output a compensation voltage to control the second piezoelectric ceramic 10 to deform toward the direction of the reduced reference arm S0, so as to drive the plane mirror 11 to move toward the direction of the reduced reference arm S0 to compensate the change of the measurement arm S1 until the photo-receiver 4 detects the central bright spot of the interference pattern again.
When the current value output from the photoelectric receiver 4 when the modulation signal is at the peak > the current value output from the photoelectric receiver 4 when the modulation signal is at the trough, that is, the waveform shown in fig. 7, it indicates that the vibrating reed 1 is deformed in a direction to increase the measurement arm S1. At this time, the CPU needs to output a compensation voltage to control the second piezoelectric ceramic 10 to deform toward the increasing reference arm S0, so as to drive the plane mirror 11 to move toward the increasing reference arm S0 to compensate the change of the measurement arm S1 until the photo-receiver 4 detects the central bright spot of the interference pattern again.
(2) Measurement of sound pressure amplitude
In the embodiment, the controller outputs a compensation voltage to control the deformation of the second piezoelectric ceramic 10 so as to track the deformation amount of the vibrating reed 1, and further calculate the amplitude of the marine noise according to the magnitude of the compensation voltage output by the controller. The specific method comprises the following steps: outputting an analog compensation voltage U by CPU cooperating with D/A convertercmpThe compensation voltage U is adjustedcmpAfter the amplification processing, the amplified signal is applied to the second piezoelectric ceramic 10 to control the second piezoelectric ceramic 10 to deform, so as to drive the plane mirror 11 to move, so that the interference fringes move in the opposite direction to compensate the change of the measurement arm S1, until the interference pattern detected by the photoelectric receiver 4 returns to the initial state. In this embodiment, the photoreceiver 4 re-detects the central bright spot of the interference pattern.
It is known to control the magnitude of deformation of the second piezoelectric ceramic 10 to
The voltage that the controller needs to output is U, where λ is the wavelength of the laser light emitted by the laser 3, and then there are:
wherein,outputting a compensation voltage U for the controllercmpThe deformation amplitude of the second piezoelectric ceramic 10 is, the compensation value of the vibration component is:
i.e. the amplitude of the background noise of the ocean is
. At this time, the intensity of the ocean background noise can be converted by combining the intensity of the vibrating reed 1, and the corresponding sound pressure level is determined. If an 8-bit D/A converter is selected, the compensation voltage U can be adjustedcmpFinely divided to the laser wavelength
To improve the detection accuracy.
In order to reduce the overall size of the sound pressure monitoring apparatus, the present embodiment preferably adopts the layout structure shown in fig. 3 for the layout manner of the optical path system in the device chamber B. Namely, three mirrors 6, 7, 12 are added to the optical path system to change the transmission path of the laser beam. Specifically, in the device chamber B, the laser 3 and the first mirror 6 are preferably mounted at an upper position; a second reflecting mirror 7 and the spectroscope 5 are arranged at the middle position, and the second reflecting mirror 7 and the vibrating reed 1 are arranged at the left side and the right side of the spectroscope 5 respectively; the third mirror 12 and the flat mirror 11 are mounted at a lower position. The three mirrors 6, 7, 12 are arranged obliquely at an acute angle of 45 ° to the horizontal, see the arrangement shown in fig. 3. Therefore, the laser light emitted by the laser 3 is transmitted along the horizontal direction, enters the first reflecting mirror 6 at an incident angle of 45 degrees, is reflected by the first reflecting mirror 6 to form a light beam in the vertical direction, and then enters the second reflecting mirror 7 at an incident angle of 45 degrees; the light beam reflected by the second reflecting mirror 7 is expanded by the beam expander 8, transmitted in the horizontal direction, and then incident on the beam splitter 4 at an incident angle of 45 °, reflected by the beam splitter 4 to form a first section of reference arm light beam S0-1 in the vertical direction, incident on the third reflecting mirror 12 at an incident angle of 45 °, further reflected by the third reflecting mirror 12 to form a second section of reference arm light beam S0-2 in the horizontal direction, and then emitted to the vertically arranged plane reflecting mirror 11. The sum of the lengths of the two reference arm beams is the length of S0. The photoelectric receiver 4 is horizontally arranged above the spectroscope 5, so that two beams of light emitted to the photoelectric receiver 4 can vertically enter a photosensitive receiving head of the photoelectric receiver 4 to form an ideal interference pattern. By adopting the design mode, the length and the width of the shell 2 can be effectively controlled, and the miniaturization design of the whole equipment is further facilitated.
As a preferable configuration of the present embodiment, the case 2 of the sound pressure monitoring apparatus may be designed to be cylindrical, and the vibrating reed 1 may be designed to be circular to fit with a port of the cylindrical case 2. The vibrating reed 1 is preferably made of a material with high rigidity, such as a stainless steel plate, so that the sound pressure monitoring device can withstand a deep sea environment with high pressure and can work normally even if placed in a deep sea environment of 500 m. Of course, the present embodiment is not limited to the above examples.
Adopt the sound pressure monitoring equipment of this embodiment, compare traditional sound pressure monitoring devices and have following apparent advantage:
(1) the precision is high, the linearity is good, signals are not attenuated in the range of 0-10kHz, particularly in a low-frequency band, and the frequency response characteristic is good;
(2) the performance is stable, the measurement precision is less influenced by the sensitivity of devices in equipment, and the manufacturing integration is easy to realize;
(3) the sealing performance is good, and the underwater air conditioner can normally work in an underwater environment of 500 meters or even deeper.
Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and the changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also belong to the protection scope of the present invention.
Claims (10)
1. The utility model provides an ocean background noise sound pressure signal monitoring facilities which characterized in that: the device comprises a shell, and an optical path system, a control system and a power supply system which are arranged in the shell; the left side or the right side of the shell is provided with an opening, a vibrating piece with a reflecting surface is arranged at the opening, a closed cavity is formed by the vibrating piece and the shell, and the reflecting surface of the vibrating piece faces the cavity; a partition plate with a perspective window is arranged in the cavity to divide the cavity into a left part and a right part, wherein the cavity in which the vibrating reed is arranged is an air chamber and is communicated with an air bag positioned outside the shell through a pipeline, and the other cavity is a device chamber and is provided with the control system, the power supply system, a laser in the optical path system, the semi-transmission semi-reflection spectroscope, the plane reflector and the photoelectric receiver; the laser device emits laser to the spectroscope, one path of light beam is formed by reflection of the spectroscope and emitted to the plane reflector as a reference arm, and the other path of light beam is formed by transmission and emitted to a reflecting surface of the vibrating piece as a measuring arm which penetrates through the transparent window; two paths of light beams reflected by the plane reflecting mirror and the vibrating plate form interference through the spectroscope and then are emitted into the photoelectric receiver, and then a current output signal is generated by the photoelectric receiver and transmitted to a controller in a control system; the control system also comprises piezoelectric ceramics which are arranged on the plane reflector, receive voltage signals output by the controller and drive the plane reflector to move by utilizing self deformation.
2. The marine background noise acoustic pressure signal monitoring device of claim 1, wherein: two piezoelectric ceramics are arranged on the plane reflector.
3. The marine background noise acoustic pressure signal monitoring device of claim 2, wherein: the two piezoelectric ceramics are butted and bonded together according to the same polarization direction and are arranged on the back surface of the plane reflector.
4. The marine background noise acoustic pressure signal monitoring device of claim 1, wherein: the controller comprises an A/D converter, a D/A converter and a CPU, and a current output signal output by the photoelectric receiver is converted into a digital signal by the A/D converter and then is transmitted to the CPU; the CPU outputs a voltage signal to the piezoelectric ceramic through a D/A converter.
5. The marine background noise acoustic pressure signal monitoring device of claim 1, wherein: an electromagnetic valve is arranged in the pipeline and receives the switch control signal output by the controller.
6. The marine background noise acoustic pressure signal monitoring device of claim 1, wherein: the perspective window is made of plane glass.
7. The marine background noise acoustic pressure signal monitoring apparatus according to any one of claims 1 to 6, wherein: the optical path system also comprises three reflecting mirrors which are obliquely arranged, a first reflecting mirror and the laser are arranged at the upper position in the device chamber, a second reflecting mirror and the spectroscope are arranged at the middle position, the second reflecting mirror and the vibrating piece are respectively arranged at the left side and the right side of the spectroscope, and a third reflecting mirror and the plane reflecting mirror are arranged at the lower position; the laser emits laser along the horizontal direction, the laser irradiates into a first reflecting mirror at an incidence angle of 45 degrees, light beams in the vertical direction formed by reflection enter into a second reflecting mirror at an incidence angle of 45 degrees, then the light beams in the horizontal direction formed by reflection through the second reflecting mirror irradiate into a spectroscope at an incidence angle of 45 degrees, a first section of reference arm light beams in the vertical direction formed by reflection through the spectroscope irradiates into a third reflecting mirror at an incidence angle of 45 degrees, and then a second section of reference arm light beams in the horizontal direction formed by reflection through the third reflecting mirror irradiates to a plane reflecting mirror which is vertically arranged; the photoelectric receiver is arranged above the spectroscope and receives two beams of light rays which vertically enter.
8. The marine background noise acoustic pressure signal monitoring device of claim 7, wherein: and a beam expander is also arranged between the second reflecting mirror and the spectroscope, and the diameter of the laser beam emitted by the laser is expanded through the beam expander.
9. The marine background noise acoustic pressure signal monitoring apparatus according to any one of claims 1 to 6, wherein: and the device chamber is also internally provided with a communication system which is connected with the controller and uploads a detection result generated by the calculation of the controller to an upper computer for display and storage.
10. The marine background noise acoustic pressure signal monitoring device of claim 9, wherein: the communication system is connected with the upper computer for communication through a communication cable.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220225285 CN202676278U (en) | 2012-05-18 | 2012-05-18 | A sound pressure signal monitoring device of ocean background noise |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220225285 CN202676278U (en) | 2012-05-18 | 2012-05-18 | A sound pressure signal monitoring device of ocean background noise |
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| CN 201220225285 Expired - Fee Related CN202676278U (en) | 2012-05-18 | 2012-05-18 | A sound pressure signal monitoring device of ocean background noise |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108327854A (en) * | 2017-12-29 | 2018-07-27 | 中国船舶重工集团公司第七0研究所 | A kind of drift anchor system buoy for detecting underwater sound signal |
| CN111272430A (en) * | 2020-04-13 | 2020-06-12 | 合肥工业大学 | Bearing vibration measuring device based on optical interference principle and measuring method thereof |
| CN111829648A (en) * | 2020-07-23 | 2020-10-27 | 中国电子科技集团公司第四十九研究所 | Piezoelectric noise sensor probe |
| CN113296137A (en) * | 2020-02-24 | 2021-08-24 | 香港理工大学深圳研究院 | Interferometric deformation monitoring method and device and receiver |
-
2012
- 2012-05-18 CN CN 201220225285 patent/CN202676278U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108327854A (en) * | 2017-12-29 | 2018-07-27 | 中国船舶重工集团公司第七0研究所 | A kind of drift anchor system buoy for detecting underwater sound signal |
| CN113296137A (en) * | 2020-02-24 | 2021-08-24 | 香港理工大学深圳研究院 | Interferometric deformation monitoring method and device and receiver |
| CN113296137B (en) * | 2020-02-24 | 2023-11-17 | 香港理工大学深圳研究院 | Interference type deformation monitoring method, device and receiver |
| CN111272430A (en) * | 2020-04-13 | 2020-06-12 | 合肥工业大学 | Bearing vibration measuring device based on optical interference principle and measuring method thereof |
| CN111829648A (en) * | 2020-07-23 | 2020-10-27 | 中国电子科技集团公司第四十九研究所 | Piezoelectric noise sensor probe |
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Granted publication date: 20130116 Termination date: 20130518 |